A candle ( tea Light ) caused damage to upvc window sill. It has left a brown mark and it looks to have melted the plastic. What can I do?
The proper way to fix this would be to replace the window cill. You can purchase PVC cills from companies such as Eurocell.
http://www.eurocell.co.uk/
The bodgit way would be to sand down the damaged area, fill it with filler from a car parts shop and spray paint over the area with acrylic paint.